Working principle of threshers

Threshing separates grains from panicles, cobs and pods. Threshing is based on the principle that:

1. Some impact is given on crops, the grains are separated from panicles, cobs or pods
2. The crop mass passes through a gap between drum and concave, wearing or rubbing action take place. This separates grain from panicles.

The efficiency and quality of threshing depends upon:

I. Drum speed

ii. Number of beaters

iii. Drum size

iv. Gaps between drum and concave

v. Quality and condition of plant mass fed to the thresher

vi. Direction of feeding and

vii. Rate of feeding